Add tasks for all the new languages

Task/Assertions/Apex/assertions-1.apex

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+String myStr = 'test;
+System.assert(myStr == 'something else', 'Assertion Failed Message');

Task/Assertions/Apex/assertions-2.apex

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+Integer i = 5;
+System.assertEquals(6, i, 'Expected 6, received ' + i);

Task/Assertions/Apex/assertions-3.apex

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+Integer i = 5;
+System.assertNotEquals(5, i, 'Expected different value than ' + i);